Re: [GtkGLExt] X crash in double mode

[Luca Cappa <luca cappa i-medlab com>]

Florent Teichteil wrote:
> Michalis Kamburelis a écrit :
>
> > Alex Queiroz wrote:
> >
> >
> > > Hallo,
> > >
> > >       I'm basically using the logo.cc demo as a guide, but my
> > > application fails when I request a double-buffered mode. The error
> > > message from Gdk is:
> > >
> > > === BEGIN ===
> > > The program 'orbis' received an X Window System error.
> > > This probably reflects a bug in the program.
> > > The error was 'BadColor (invalid Colormap parameter)'.
> > >  (Details: serial 360 error_code 12 request_code 1 minor_code 0)
> > >  (Note to programmers: normally, X errors are reported asynchronously;
> > >   that is, you will receive the error a while after causing it.
> > >   To debug your program, run it with the --sync command line
> > >   option to change this behavior. You can then get a meaningful
> > >   backtrace from your debugger if you break on the gdk_x_error()
> > > function.)
> > > === END ===
> > >
> > >     If a request a single-buffered mode the application starts ok.
> > > Has anybody seen this before?
> >
> > Are you requesting some additional OpenGL buffers, e.g. stencil or
> > accumulation buffer ? Or maybe you're requesting some unusually large
> > color depth ? Depending on your graphic card and OpenGL implementation
> > you may not be able to get double-buffered visuals if you request such
> > additional buffers (especially with large bits, i.e. pixel size). If
> > you're under XWindows, you can use `glxinfo' program to check if what
> > you request is available.
> >
> > Note that the error message you show, "BadColor (invalid Colormap
> > parameter)", doesn't suggest the above explanation. But the symptoms
> > that you describe (program runs with single buffer, doesn't run with
> > double buffer) would suggest the above explanation.
> >
> > Michalis


Hello,
I had that error recently, the solution for me has been to use this flag 
given to the executable:

--gdk-gl-no-standard-colormap

Greetings,
Luca